Grape planting stock will be admitted into the state of Washington provided the following provisions are complied with:

(1) An official certificate issued by the plant protection organization of the state, district, or territory of origin certifying that the grapevines meet the requirements of this chapter must accompany the grape planting stock into the state.

(2) The grape planting stock has been certified in accordance with the regulations of an official grapevine certification program that includes inspection and testing by methods approved by the director for grapevine fanleaf virus, grapevine leafroll associated viruses, grapevine virus A, grapevine virus B, and Xylella fastidiosa.

(3) Each shipment of grapevines, grape rootstock, or softwood cuttings from a state infested with grapevine phylloxera or vine mealybug require one of the following statements on the certificate:

(a) The grapevines, rootstock, or softwood cuttings were grown in and shipped from an area known to be free from grape phylloxera and vine mealybug; or

(b) The grapevines, rootstock, or softwood cuttings were grown under an approved sterile media system; or

(c) For small shipments (five hundred articles or less), softwood cuttings were inspected by a state, district, or territory plant regulatory official and were found to be free from grape phylloxera and vine mealybug; or

(d) The grapevines, rootstock, or softwood cuttings were subject to one of the two treatments in subsection (4) of this section or other treatments determined to be effective and are approved in writing by the director. The treated grapevines must be stored in a manner after treatment that would prevent reinfestation.

(4) Acceptable treatments for grapevine insect pests include:

(a) Hot water treatment. Dormant, rooted grapevines or rootstock shall be washed to remove all soil or other propagative media. Dormant rooted plants or rootstock shall be immersed in a hot water bath for a period of not less than three minutes nor more than five minutes at a temperature of not less than 125°F (52°C) nor more than 130°F (55°C) at any time during immersion; or

(b) Methyl bromide fumigation. Grapevines, rootstock, or softwood cuttings may be treated by methyl bromide fumigation. The fumigation shall be in an approved gastight fumigation chamber, equipped with a heating unit, fan for dispersal of gas and clearing the chamber of gas after fumigation, and interior thermometer readable from the outside. Fumigation shall be with a dosage of two pounds (0.908 kg) of methyl bromide per one thousand cubic feet (twenty-eight cubic meters) for a period of three hours at a temperature of between 65°F (18.3°C) and 70°F (21.1°C). The fan shall be operated for a period of ten minutes after the injection of the gas.

(5) All shipments of grapevines, rootstock, or softwood cuttings from a quarantine area shall be plainly marked with the contents on the outside of the package or container as "grapevines," "grape rootstock," or "grape cuttings."